polygons

In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.

在该地区发现大量小丘、石环冰缘现存在。

A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.

四个边相行四边形；不是直角边行四边形。